Construction technology of circular coal yard grid

Abstract

The present application relates to a kind of round coal yard grid construction technology, and the specific steps of the method are as follows: S1: installation preparation work, S2: grid starting unit installation operation, transition plate installation, block grid assembly, block grid hoisting, block grid fixation and block grid in-air butt joint operation are sequentially carried out, S3: the installation of subsequent grid, after block grid closing is completed, it is into the aerial bulk of grid, aerial bulk is from the second ring of upper chord of grid, first, a crane is used to install small assembly unit of upper chord, when installation is to 1 / 4 ring, another crane is added to start to install small assembly unit of lower chord, so it is closed installation to the whole spherical shell in circle, S4: the installation operation of purline, supporting installation, main purline installation and secondary purline installation are sequentially carried out, S5: color plate installation;Detailed operation steps are provided for the specific hoisting operation of spherical grid, and the safety and work efficiency when installing operation of spherical grid are improved.

Description

Technical Field

[0001] This invention relates to the field of space frame construction technology, specifically to a construction process for a circular coal yard space frame. Background Technology

[0002] The circular coal yard grid refers to a construction technique that uses hoisting to assemble and fix the grid to form a circular structure. For spherical grid shells, the initial unit is installed to form a closed structure, and then the closed structure is used as a support system to install the subsequent grid using the method of circumferentially assembled small units.

[0003] Patent document CN106869507A discloses an installation process for a super-large truss spanning a spherical warehouse. The specific steps are: (1) segmented assembly of the truss with the ground; (2) design and erection of temporary supports; (3) hoisting and temporary reinforcement of the upper truss section of the warehouse wall; (4) hoisting of the truss section inside the warehouse; and (5) removal of temporary supports. This invention provides an installation process for a super-large truss spanning a spherical warehouse, which differs from the traditional overall installation process for super-large trusses spanning a spherical warehouse. It is segmented and does not require a large area of ​​space inside the spherical warehouse for a long time. During the successful hoisting, the tonnage is greatly reduced after segmentation, and the requirements for crane selection and hoisting site are also greatly reduced. It ensures that the truss can be "attached" without being restricted by the construction of the upper space frame of the spherical warehouse and the assembly site inside the warehouse, thus avoiding the impact of cross-construction to the greatest extent, improving efficiency, saving costs, and ensuring safety and reliability.

[0004] The above method has the following shortcomings: Firstly, it omits specific construction steps for circular space frames and lacks detailed explanations of crucial assembly stages, which can easily lead to operational errors by construction personnel and hinder on-site construction. Secondly, the construction of spherical space frames differs from traditional space frame structures. Key steps such as slab installation, block space frame assembly, block space frame hoisting, block space frame fixing, and aerial docking of block space frames are not detailed, introducing uncertainty and increasing construction risks. Thirdly, the method omits purlin installation steps, a critical process for the installation of the cladding panels. Omitting these steps prevents the subsequent installation of the cladding panels, resulting in incomplete space frame installation. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems and shortcomings by providing a construction process for a circular coal yard grid structure, thereby improving overall work efficiency.

[0006] The technical problem solved by this invention is:

[0007] (1) The above method omits some specific construction steps for circular space frames and does not provide detailed explanations of key assembly steps, which may easily lead to operational errors by construction personnel and is not conducive to on-site construction operations.

[0008] (2) Furthermore, the construction process of spherical space frame is somewhat different from that of traditional space frame structure. The key steps of installation of slabs, assembly of block space frame, hoisting of block space frame, fixing of block space frame and aerial docking of block space frame are not explained in detail. The above methods are uncertain during operation, which increases the construction risk of space frame.

[0009] (3) At the same time, the above method omits the purlin installation steps. Purlin installation is a key process in the installation of the cladding color plate. The omission of the purlin installation steps will prevent the above-mentioned space frame structure from carrying out the subsequent installation of the cladding color plate, thus causing the space frame installation to be incomplete.

[0010] The objective of this invention can be achieved through the following technical solution: a construction process for a circular coal yard grid structure, the specific steps of which are as follows:

[0011] S1: Preparatory work before installation, use a total station to check the foundation, adjust the deviation, prepare the facilities required for the installation of the starting unit, prepare drawings, level the construction site, prepare the materials required for the composite starting unit, and bring the materials and facilities to the site.

[0012] S2: Installation operation of the starting unit of the space frame, which includes the installation of the transition plate, the assembly of the block space frame, the hoisting of the block space frame, the fixing of the block space frame, and the aerial docking of the block space frame in sequence;

[0013] S3: Subsequent installation of the space frame. After the block space frame is assembled, the high-altitude assembly of the space frame begins. The high-altitude assembly starts from the second ring of the upper chord of the space frame. First, a crane is used to install the small assembly unit of the upper chord. When the installation reaches 1 / 4 of the ring, another crane is added to start installing the small assembly unit of the lower chord. This process is repeated circumferentially until the entire spherical shell is completed.

[0014] S4: Purlin installation operation, proceeding with support installation, main purlin installation and secondary purlin installation in sequence;

[0015] S5: Color plate installation, proceed with positioning the first plate, fixing the subsequent plates, installing the upper plate and the ridge cover plate in sequence.

[0016] As a further technical solution of the present invention, S2 includes the following steps: When installing the transition plate, the transition plate is positioned according to the edge line popped out on the support surface, and the four sides of the transition plate are temporarily fixed first. The fixing is reinforced with blocks. The size of the blocks is 40mm (length) * 40mm (width) * 20mm (thickness). After the blocks are connected, the supports are fully welded. When assembling the block space frame, the size of the space shell is measured. According to the size of the space shell, each block space frame has one grid on the upper chord and one grid on the lower chord in the height direction, and seven grids on the upper chord and six grids on the lower chord in the circumferential direction. The space shell has a total of 36 axes. Every two axes are divided into one block unit, and a total of 18 block space frames of the same size are divided. The block space frame is assembled as a whole on the ground. During assembly, all rods are installed and tightened.

[0017] As a further technical solution of the present invention, S2 includes the following steps: During the hoisting operation of the block grid frame, personnel are on-site to direct the operation. The binding method adopts the four-point binding method. During hoisting, a trial hoisting method is first adopted, that is, the block grid frame is hoisted 200mm off the ground and then the hoisting is stopped to check the deformation of the block grid frame, the firmness of the binding, and the stability of the crane. If there are no abnormalities, it is hoisted to 200mm above the top surface of the transition plate, so that the holes of the support bottom plate are aligned with the bolts of the transition plate. Then the crane is directed to descend. During the block grid frame fixing and block grid frame aerial docking operation, after the block grid frame support is in place, the position is adjusted, and then all nuts are tightened. The other end is fixed with a steel wire rope. The steel wire rope is arranged so that one is installed every other support. Since the center of gravity of the starting block is on the outside of the silo wall, the steel wire rope is arranged inside the silo. Each steel wire rope is equipped with a ground anchor at the lower end, and a total of 18 cables are set. Each cable is equipped with a chain hoist to adjust the installation angle of the starting block until the first ring of the grid frame is installed and closed. Finally, the support is welded.

[0018] As a further technical solution of the present invention, S2 includes the following steps: When the block grid is connected in the air, an installer is arranged at each connection point. After receiving the corresponding installation rod, the installer first screws the high-strength bolt into the bolt ball for three to five turns. According to the installation situation of other installers, after all the installation bolts are in the bolt ball, the high-strength bolts are tightened into place together. It is necessary to avoid tightening one or two high-strength bolts first, as this will make it difficult for other high-strength bolts to be installed in place.

[0019] As a further technical solution of the present invention, the characteristic of step S3 is that it includes the following steps: according to the lifting height of the crane, the tonnage gradually increases, in the following order: 25T for installing the first 4 rings of the space frame, 50T for installing 5-9 rings of the space frame, 100T for installing 10-15 rings of the space frame, and 130T for installing the remaining space frame. Since the length of the main boom plus the auxiliary boom of the 50T truck crane is 57.7 meters, the maximum elevation angle is 78°, and the maximum lifting height is 55 meters, the lifting capacity in this state is 2.5T, and the maximum weight of the space frame triangular cone is approximately 0.3T, therefore it can... The lifting capacity of the 100T truck crane is 68.1 meters long (main boom + jib), with a maximum elevation angle of 78° and a maximum lifting height of 65 meters. Its lifting capacity in this configuration is 3.6T, and the maximum weight of the space frame triangular cone is approximately 0.3T, thus meeting its lifting requirements. Similarly, the lifting capacity of the 130T truck crane is 86 meters long (main boom + jib), with a maximum elevation angle of 78° and a maximum lifting height of 82 meters. Its lifting capacity in this configuration is 2.9T, and the maximum weight of the space frame triangular cone is approximately 0.3T, thus meeting its lifting requirements.

[0020] As a further technical solution of the present invention, S4 includes the following steps: Before installation, the purlin plate should be welded onto the support according to the drawings, and then the support specification corresponding to the corresponding bolt ball should be found according to the support layout diagram. Then the support bolt should be screwed into the bolt ball and tightened. Finally, the position of the support should be finely adjusted according to the direction of the purlin to complete the support installation operation.

[0021] As a further technical solution of the present invention, S4 includes the following steps: When installing the main purlin, according to the purlin layout diagram, it is divided into different construction sections. In each construction section, the main purlin is installed first, and then the secondary purlins are installed until the entire spherical surface is covered. The specific operation is as follows: Step 1, determine the reference point. The reference point is determined on the baseline of the spherical shell. The reference point is the center of the support at the top of the shell and the eaves support. Step 2, connect the two reference points with the construction line and tension the construction line as the reference line. If the reference line does not coincide with the center line of the shell support, adjust the support position. Step 3, measure the distance between each support plate and the reference line. Adjust the support plate with a distance deviation of more than 5mm. Correct the support plate with large deformation. The purlin can be installed only after the support plate meets the requirements. The straightness of the purlin must be ensured when arranging it. Step 4, after the main purlin is installed, the smoothness of the purlin surface should be measured. If the error exceeds the requirements, it should be adjusted.

[0022] As a further technical solution of the present invention, S4 includes the following steps: During the installation of the secondary purlins, the installation direction and the overall installation sequence of the secondary purlin strips are arranged in a concentric circle evenly from bottom to top. The installation steps are as follows: First, determine the position of the first secondary purlin on the main purlin according to the design drawings and make a mark, and then connect the secondary purlin to the main purlin according to the marked position.

[0023] As a further technical solution of the present invention, the characteristic of S5 is that it includes the following steps: When installing the color plate, determine the installation direction and lay out the positioning lines. First, determine the position of the layout starting line according to the layout design of the drawings, divide the roof panel into 8 areas, set 8 ridge lines, find the middle meridian of the area between every two ridge lines, and use the construction line to represent this meridian. This meridian is the installation center line of the first plate in the area. The installation sequence of the color plate is from left to right or from right to left, and then from bottom to top. Position the first plate. The quality of the installation of the first plate directly affects the installation of other plates. Therefore, when installing the first plate, it is necessary to pay attention to quality control, make its width direction midpoint coincide with the installation construction line, its length direction perpendicular to the secondary purlin, and fix it with self-tapping screws. Then apply sealant to the nailing position. There is one self-tapping screw for each wave peak.

[0024] As a further technical solution of the present invention, the characteristic of S5 is that it includes the following steps: when fixing the subsequent plates, after the first plate is installed, the other plates are installed in sequence to both sides. It is required that the plates installed later should be tucked under the last crest of the previous plate, and should not be pressed on top of the previous plate. This is one of the waterproofing measures of the spherical shell and should be strictly followed. When installing the upper plate, repeat the above installation steps. After installing each construction area according to the layout diagram, the gaps between each construction area are finally sealed with the ridge cover plate. The ridge cover plate should be installed together with the roof panel and fixed to the crest of the roof panel with blind rivets. The overlap between the ridge cover plates is to overlap the flashing plate near the top of the slope along the slope direction. The overlap length is 200mm and it is fixed with rivets. The rivet connection should also be coated with sealant. The rivet spacing is less than 200mm. The ridge cover plate is the main line of the spherical shell, so it is necessary to use a string line for positioning during installation to ensure its installation quality.

[0025] The beneficial effects of this invention are:

[0026] (1) In the construction process of the circular coal yard grid structure, when hoisting the block grid structure, the four-point binding method is adopted. During hoisting, a trial hoisting method is first used, that is, the block grid structure is hoisted 200mm off the ground and then stopped to check the deformation of the block grid structure, the firmness of the binding, and the stability of the crane. If there are no abnormalities, it is then hoisted to 200mm above the top surface of the transition plate, so that the holes of the support bottom plate are aligned with the bolts of the transition plate. Then the crane is directed to descend. The trial hoisting method can effectively improve the safety of the grid structure hoisting operation. When fixing the block grid structure and connecting the block grid structure in the air, the block grid structure... After the support is in place and its position is adjusted, all nuts are tightened, and the other end is fixed with steel wire ropes. The steel wire ropes are arranged such that one is installed every other support. Since the center of gravity of the starting block is on the outside of the silo wall, the steel wire ropes are arranged inside the silo. Each steel wire rope is anchored at the bottom, and a total of 18 cables are installed. Each cable is equipped with a chain hoist to adjust the installation angle of the starting block until the first ring of the silo is installed and closed. Finally, the support is welded. This provides detailed operating procedures for the specific hoisting operation of the spherical silo, improving the safety of the silo hoisting operation.

[0027] (2) In the construction process of the circular coal yard grid, when assembling the grid, for the aerial connection of the block grid, each connection point needs to be assigned an installer. After receiving the corresponding installation rod, the installer first screws the high-strength bolts into the bolt ball three to five turns. According to the installation situation of other installers, after all the installation bolts have entered the bolt ball, the high-strength bolts are tightened together. It is necessary to avoid tightening one or two high-strength bolts first, which will make it difficult for other high-strength bolts to be installed in place, thereby effectively improving the aerial connection effect of the block grid. After the block grid is assembled, the high-altitude assembly of the grid begins. The high-altitude assembly starts from the second ring of the upper chord of the grid. First, a crane is used to install the upper chord small assembly unit. When the 1 / 4 ring is installed, another crane is added to start installing the lower chord small assembly unit. In this way, the ring is closed and installed until the entire spherical shell is completed. The high-altitude assembly steps of the grid are explained in detail, reducing the error rate in the construction process and improving the overall work efficiency, which facilitates the high-altitude construction operation of the circular grid.

[0028] (3) In the construction process of this circular coal yard grid structure, the installation of purlins requires sequential installation of supports, main purlins, and secondary purlins to lay the foundation for subsequent color plate installation. According to the purlin layout diagram, the construction is divided into different sections. In each section, the main purlins are installed first, followed by the secondary purlins, until the entire spherical surface is covered. Specifically, according to the purlin layout diagram, the construction is divided into different sections. In each section, the main purlins are installed first, followed by the secondary purlins, until the entire spherical surface is covered. The specific operation is as follows: Step 1, determine the reference point. The reference point is determined on the baseline of the spherical grid shell. The reference point is the center of the support at the top of the grid shell and the eaves support. Step 2, connect the two reference points with the construction line and tension the construction line as the reference line. If the reference line does not coincide with the center line of the grid shell support, adjust the support position. Step 3: Measure the distance between each support plate and the baseline. Adjust support plates with a distance deviation exceeding 5mm. Correct support plates with large deformations. Only after the support plates meet the requirements can the purlins be installed. Ensure the straightness of the purlins during installation. Step 4: After the main purlins are installed, measure the smoothness of the purlin surface. If the error exceeds the requirements, make adjustments. When installing secondary purlins, the installation direction and the overall installation sequence of the secondary purlins should be arranged evenly in a concentric circle from bottom to top. The installation steps are as follows: First, determine the position of the first secondary purlin on the main purlin according to the design drawings and mark it. Then connect the secondary purlins to the main purlins according to the marked positions. Through the above operations, the installation of the purlins of the spherical space frame can be accurately completed, facilitating the subsequent installation of the colored steel plates and thus improving the integrity of the circular space frame construction. Attached Figure Description

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] See Figure 1 The following describes a construction process for a circular coal yard grid structure. The specific steps of this method are as follows:

[0033] S1: Preparatory work before installation, use a total station to check the foundation, adjust the deviation, prepare the facilities required for the installation of the starting unit, prepare drawings, level the construction site, prepare the materials required for the composite starting unit, and bring the materials and facilities to the site.

[0034] S2: Installation operation of the starting unit of the space frame, which includes the installation of the transition plate, the assembly of the block space frame, the hoisting of the block space frame, the fixing of the block space frame, and the aerial docking of the block space frame in sequence;

[0035] S3: Subsequent installation of the space frame. After the block space frame is assembled, the high-altitude assembly of the space frame begins. The high-altitude assembly starts from the second ring of the upper chord of the space frame. First, a crane is used to install the small assembly unit of the upper chord. When the installation reaches 1 / 4 of the ring, another crane is added to start installing the small assembly unit of the lower chord. This process is repeated circumferentially until the entire spherical shell is completed.

[0036] S4: Purlin installation operation, proceeding with support installation, main purlin installation and secondary purlin installation in sequence;

[0037] S5: Color plate installation, proceed with positioning the first plate, fixing the subsequent plates, installing the upper plate and the ridge cover plate in sequence.

[0038] S2 includes the following steps: When installing the transition plate, position the transition plate according to the edge line popped out on the support surface, and temporarily fix the four sides of the transition plate. The fixing is reinforced with blocks. The size of the blocks is 40mm (length) * 40mm (width) * 20mm (thickness). After the blocks are connected, the supports are fully welded. When assembling the block space frame, measure the size of the space shell. According to the size of the space shell, each block space frame has one grid in the height direction of the upper chord and one grid in the lower chord. In the circumferential direction, there are seven grids in the upper chord and six grids in the lower chord. The space shell has a total of 36 axes. Every two axes are divided into one block unit, and a total of 18 block space frames of the same size are divided. The block space frame is assembled as a whole on the ground. During assembly, all members are installed and tightened.

[0039] S2 includes the following steps: When hoisting the block space frame, personnel are on-site to direct the operation. The binding method adopts the four-point binding method. During hoisting, a trial hoisting method is first used, that is, the block space frame is hoisted 200mm off the ground and then the hoisting is stopped to check the deformation of the block space frame, the firmness of the binding, and the stability of the crane. If there are no abnormalities, it is then hoisted to 200mm above the top surface of the transition plate, so that the holes of the support bottom plate are aligned with the bolts of the transition plate, and then the crane is directed to descend.

[0040] During the block grid frame fixing and overhead docking operations, after the block grid frame supports are in place and their positions are adjusted, all nuts are tightened, and the other end is fixed with steel wire ropes. The steel wire ropes are arranged such that one is installed every other support. Since the center of gravity of the starting block is on the outside of the silo wall, the steel wire ropes are arranged inside the silo. Each steel wire rope is anchored at the lower end, with a total of 18 cables. Each cable is equipped with a chain hoist to adjust the installation angle of the starting block until the first ring of the grid frame is installed and closed. Finally, the supports are welded.

[0041] S2 includes the following steps: When the block grid structure is connected in the air, an installer is assigned to each connection point. After receiving the corresponding installation rod, the installer first screws the high-strength bolt into the bolt ball three to five turns. According to the installation situation of other installers, after all the installation bolts are in the bolt ball, the high-strength bolts are tightened into place together. It is necessary to avoid tightening one or two high-strength bolts first, as this will make it difficult for other high-strength bolts to be installed in place.

[0042] S3 includes the following steps: depending on the lifting height of the crane, the tonnage gradually increases, in the following order: 25T for installing the first 4 rings of the space frame, 50T for installing 5-9 rings of the space frame, 100T for installing 10-15 rings of the space frame, and 130T for installing the remaining space frame. 50T, 100T and 130T are all crane specifications.

[0043] The 50T truck crane has a main boom and jib length of 57.7 meters, a maximum elevation angle of 78°, and a maximum lifting height of 55 meters. Its lifting capacity in this configuration is 2.5T, and the maximum weight of the space frame triangular cone is approximately 0.3T, thus meeting its lifting requirements. Similarly, the 100T truck crane has a main boom and jib length of 68.1 meters, a maximum elevation angle of 78°, and a maximum lifting height of 65 meters. Its lifting capacity in this configuration is 3.6T, and the maximum weight of the space frame triangular cone is approximately 0.3T, thus meeting its lifting requirements. Likewise, the 130T truck crane has a main boom and jib length of 86 meters, a maximum elevation angle of 78°, and a maximum lifting height of 82 meters. Its lifting capacity in this configuration is 2.9T, and the maximum weight of the space frame triangular cone is approximately 0.3T, thus meeting its lifting requirements.

[0044] S4 includes the following steps: Before installation, weld the purlin plate onto the support according to the drawings, then find the support specification corresponding to the corresponding bolt ball according to the support layout diagram, then screw the support bolt into the bolt ball and tighten it, and finally adjust the position of the support according to the direction of the purlin to complete the support installation operation.

[0045] S4 includes the following steps: When installing the main purlin, according to the purlin layout diagram, it is divided into different construction sections. In each construction section, the main purlin is installed first, and then the secondary purlins are installed until the entire spherical surface is covered. The specific operation is as follows:

[0046] Step 1: Determine the reference point. The reference point is set on the baseline of the spherical reticulated shell, and the reference point is the center of the support at the top of the reticulated shell and the eaves support.

[0047] Step 2: Connect the two reference points with a construction line, and tension the construction line as the reference line. If the reference line does not coincide with the center line of the grid shell support, adjust the position of the support.

[0048] Step 3: Measure the distance between each support plate and the baseline. Adjust the support plates with a distance deviation of more than 5mm. Correct the support plates with large deformation. Only after the support plates meet the requirements can the purlins be installed. The purlins must be laid out to ensure their straightness.

[0049] Step four: After the main purlins are installed, the smoothness of the purlin surface should be measured. If the error exceeds the requirements, adjustments should be made.

[0050] S4 includes the following steps: When installing secondary purlins, the installation direction and the overall installation sequence of the secondary purlin strips are arranged evenly in a concentric circle from bottom to top. The installation steps are as follows: First, determine the position of the first secondary purlin on the main purlin according to the design drawings and make a mark. Then, connect the secondary purlin to the main purlin according to the marked position.

[0051] S5 includes the following steps: When installing the color plate, determine the installation direction and lay out the positioning. First, determine the position of the layout starting line according to the layout design of the drawings. Divide the roof panel into 8 areas and set 8 ridge lines. Find the middle meridian of the area between every two ridge lines and use the construction line to represent this meridian. This meridian is the installation center line of the first panel in the area.

[0052] The installation sequence of the color-coated steel sheets is from left to right or from right to left, then from bottom to top. Position the first sheet, as the quality of its installation directly affects the installation of the other sheets. Therefore, when installing the first sheet, pay close attention to quality control, ensuring that the midpoint of its width coincides with the installation line, its length is perpendicular to the secondary purlin, and it is fixed with self-tapping screws. Then apply sealant to the nailing locations, one self-tapping screw per crest.

[0053] S5 includes the following steps;

[0054] When fixing subsequent plates, after the first plate is installed, the other plates are installed in sequence to both sides. It is required that the plates installed later should be tucked under the last crest of the previous plate, and not pressed on top of the previous plate. This is one of the measures for waterproofing the spherical shell and should be strictly followed.

[0055] When installing the upper panel, repeat the above installation steps. Install each construction area according to the layout diagram. Finally, seal the gaps between each construction area with the ridge cover plate. The ridge cover plate should be installed together with the roof panel and fixed to the crest of the roof panel with blind rivets. For the overlap between ridge cover plates, the flashing plate near the top of the slope should overlap on top, with an overlap length of 200mm. Fix it with rivets. Sealant should also be applied to the rivet joints. The rivet spacing should be less than 200mm. The ridge cover plate is the main line of the spherical shell, so it should be positioned with a string line during installation to ensure its installation quality.

[0056] In the application of this invention, when hoisting the block space frame, a four-point binding method is used. A trial hoisting method is first employed: the block space frame is hoisted 200mm off the ground and then stopped to check for deformation, binding strength, and crane stability. If no abnormalities are found, it is then hoisted to 200mm above the top of the transition plate, aligning the support base plate holes with the transition plate bolts. The crane is then lowered. This trial hoisting method effectively improves the safety of the space frame hoisting operation. During the fixing and aerial docking of the block space frame, the block space frame supports... After the seat is in place and the position is adjusted, all nuts are tightened. The other end is fixed with steel wire ropes. The steel wire ropes are arranged so that one is installed every other support. Since the center of gravity of the starting block is on the outside of the silo wall, the steel wire ropes are arranged inside the silo. Each steel wire rope is anchored at the bottom. A total of 18 cables are installed. Each cable is equipped with a chain hoist to adjust the installation angle of the starting block until the first ring of the silo is installed and closed. Finally, the supports are welded. This provides detailed operating procedures for the specific hoisting operation of the spherical silo and improves the safety of the silo hoisting operation.

[0057] In the construction process of this circular coal yard grid structure, during the grid structure assembly operation, for the aerial connection of the block grid structure, one installer is required for each connection point. After receiving the corresponding installation rod, the installer first screws the high-strength bolts into the bolt ball three to five turns. According to the installation situation of other installers, after all the installation bolts are in the bolt ball, the high-strength bolts are tightened into place together. It is necessary to avoid tightening one or two high-strength bolts first, as this will make it difficult to install the other high-strength bolts in place, thus effectively improving the aerial connection effect of the block grid structure. Secondly, after the block grid structure is assembled, the high-altitude assembly of the grid structure begins. The high-altitude assembly starts from the second ring of the upper chord of the grid structure. First, one crane is used to install the upper chord small assembly unit. When 1 / 4 of the ring is installed, another crane is added to start installing the lower chord small assembly unit. In this way, the ring is closed and installed in turn until the entire spherical shell is completed. The high-altitude assembly steps of the grid structure are explained in detail, which reduces the error rate in the construction process, improves the overall work efficiency, and facilitates the high-altitude construction operation of the circular grid structure.

[0058] In the construction process of this circular coal yard grid structure, the installation of purlins requires sequential installation of supports, main purlins, and secondary purlins to lay the foundation for subsequent installation of color steel plates. According to the purlin layout diagram, the construction is divided into different sections. In each section, the main purlins are installed first, followed by the secondary purlins, until the entire spherical surface is covered. Specifically, the operation is as follows: Step 1, determine the reference point. The reference point is located on the baseline of the spherical grid shell, at the center of the top support and the eaves support. Step 2, connect the two reference points with a construction line and tension the construction line as the reference line. If the reference line does not coincide with the center line of the grid shell support, adjust the support position. Third, measure the distance between each support plate and the baseline. Adjust support plates with a distance deviation exceeding 5mm. Correct support plates with large deformations. Only after the support plates meet the requirements can the purlins be installed. The purlins must be arranged to ensure their straightness. Fourth, after the main purlins are installed, measure the smoothness of the purlin surface. If the error exceeds the requirements, make adjustments. When installing secondary purlins, the installation direction and the overall installation sequence of the secondary purlins are arranged evenly in a concentric circle from bottom to top. The installation steps are as follows: First, determine the position of the first secondary purlin on the main purlin according to the design drawings and mark it. Then connect the secondary purlins to the main purlins according to the marked positions. Through the above operations, the installation of the purlins of the spherical space frame can be accurately completed, which facilitates the subsequent installation of the colored plates and improves the integrity of the circular space frame construction.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A construction process of a circular coal yard grid, characterized in that, The specific steps of the process are as follows: S1: Pre-installation preparation, use total station to check the foundation, adjust the deviation, prepare the facilities needed for the installation of the starting unit, prepare the drawings, level the construction site, prepare the materials needed for the composite starting unit, and the materials and facilities enter the site; S2: the grid starting unit installation operation, in turn, transition plate installation, block grid assembly, block grid hoisting, block grid fixed and block grid air butt joint operation, when the transition plate installation, according to the support surface pops out of the edge line of the transition plate in place, and the four edges of the transition plate first temporary fixed, fixed using a block of reinforcement, block size for long 40mm Wide 40mm Thick 20mm, to be divided block butt joint full welding, block grid assembly, measuring the size of the net shell, according to the size of the net shell, each block grid height direction for the upper chord a grid, the lower chord a grid, ring for the upper chord seven grid, the lower chord six grid, the net shell has 36 axis, every two axis is divided into 1 block unit, a total of 18 block grid of the same size, block grid using ground assembly, assembly will install all the rod fastening; S3: Installation of subsequent net racks. After the block-shaped net rack is closed, high-altitude bulk loading of the net rack is performed. High-altitude bulk loading starts from the second ring belt of the upper chord of the net rack. First, a crane is used to install small units of the upper chord. When installation reaches 1 / 4 of the ring belt, another crane is added to start installing small units of the lower chord. This process is repeated to close the installation of the entire spherical shell; S4: Installation of purline. First, the purline support plate is welded on the support according to the drawing. Then, the corresponding support specifications of the bolt ball are found according to the support layout. The support bolts are then tightened into the bolt ball. Finally, the position of the support is adjusted according to the direction of the purline support plate. The main purline is installed in different construction sections according to the purline layout. The main purline is installed first, followed by the secondary purline. The specific operation is as follows: Step one, set the reference point at the baseline of the net rack. The reference point is the center of the support at the top of the net rack and the eave support. Step two, connect the two reference points with a construction line as the reference line. If the reference line does not coincide with the center line of the net rack support, adjust the position of the support. Step three, measure the distance between each support plate and the reference line. If the distance deviation of the support plate exceeds 5mm, adjust the position of the support plate. Step four, measure the smoothness of the purline curve after the installation of the main purline. If the error exceeds the required value, adjust the position of the purline. S5: Installation of color plates. The installation of color plates includes positioning the first plate, fixing the subsequent plates, installing the upper plates, and installing the ridge cover plates. During the installation of color plates, the installation direction is determined, and the line is positioned. First, the position of the starting line is determined according to the layout design of the drawing. The roof plates are divided into 8 areas, and 8 ridge lines are set. The middle meridian line of the area is found between every two ridge lines, and the construction line is used to represent the meridian line. The meridian line is the installation center line of the first plate in the area, and the middle point of the width direction coincides with the installation construction line. The length direction is perpendicular to the secondary purline, and is fixed with self-tapping screws. The self-tapping screws are placed at every wave peak.

2. The construction process of a circular coal yard net rack according to claim 1, characterized in that, S2 includes the following steps: The four-point binding method is adopted in the hoisting operation of the block-shaped net rack. The trial hoisting method is adopted in the hoisting, that is, the block-shaped net rack is hoisted 200 mm away from the ground, and then the hoisting is stopped. The deformation of the block-shaped net rack, the fastening of the block-shaped net rack, and the stability of the crane are checked. When there is no abnormality, the block-shaped net rack is hoisted to the top surface of the transition plate by 200 mm. The holes of the support base plate are aligned with the bolts of the transition plate. Then the crane is lowered. The block-shaped net rack is fixed and the block-shaped net rack is connected in the air. The position of the block-shaped net rack support is adjusted after being placed. Then all the nuts are tightened. The net rack is fixed by using steel wire ropes. One steel wire rope is arranged every other support. Since the center of gravity of the starting block is outside the warehouse wall, the steel wire ropes are arranged inside the silo. The lower end of each steel wire rope is provided with a ground anchor. A total of 18 cables are arranged. One chain is arranged for each cable to adjust the installation angle of the starting block. Until the first circle of the net rack is installed and closed, the support is finally welded.

3. The construction process of a circular coal yard net rack according to claim 1, characterized in that, S2 includes the following steps: When the block-shaped net rack is connected in the air, one installation personnel is arranged at each connection point. After receiving the corresponding installation rod, the installation personnel initially screws the high-strength bolt into the bolt ball by three to five turns. After all the installation bolts are screwed into the bolt ball, the high-strength bolt is tightened in place.

4. The construction process of a circular coal yard net rack according to claim 1, characterized in that, S3 includes the following steps: According to the lifting height of the crane, the tonnage is gradually increased. The tonnage is 25T for the installation of the first 4 circles of the net rack, 50T for the installation of the 5th to 9th circles of the net rack, 100T for the installation of the 10th to 15th circles of the net rack, and 130T for the installation of the remaining net rack.

5. The construction process of a circular coal yard space truss according to claim 1, characterized in that, S4 includes the following steps: When the secondary purlin is installed, the installation direction is arranged in a concentric circular ring from bottom to top. The installation steps are as follows: first, the position of the first secondary purlin on the main purlin is determined according to the design drawing and a mark is made. Then the secondary purlin is connected with the main purlin according to the mark position.

6. The construction process of a circular coal yard space truss according to claim 1, characterized in that, S5 includes the following steps: When the subsequent plate is fixed, the first plate is installed, and then the other plates are installed to both sides in sequence. The requirement is that the rear-mounted plate should be inserted under the last wave crest of the previous plate, and cannot be pressed on the upper surface of the previous plate. When the upper plate is installed, the above steps are repeated. According to the layout drawing, each construction area is installed. Finally, the gap between each construction area is covered with a ridge cover plate.

Images